Offshore wind with high energy density and low turbulence has attracted the global scientific community towards the development of the Offshore Wind Turbines (OWTs). Today, most of the shallow water sites are already occupied, and the industry is looking to install turbines at the deep water sites (water depth > 50m). However, an OWT support structure designed with the conventional concepts becomes massive and expensive in deeper waters. In contrast, floating OWTs are more expansive than the bottom supported ones, and considered suitable for a water depth of 60 m or more. A novel support structure concept termed a ‘bottom supported tension leg tower’ (BSTLT) has been proposed recently and the possibility of using bottom supported structures in deeper waters is shown. In this paper, an extension of the BSTLT concept has been achieved using inclined tethers with a monopile. The preliminary technical feasibility including the sensitivity of the natural frequencies and dynamic analyses considering the in-place operating and the extreme design conditions has been studied for 50 m water depth. The results show that the proposed concept can be utilized to make the monopile based support structures more cost-efficient for the water depth stated above.

中文翻译：

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用于海上风力涡轮机的带有倾斜系绳的底部支撑张力腿塔

具有高能量密度和低湍流的海上风电吸引了全球科学界对海上风力涡轮机 (OWT) 的发展。如今，大部分浅水站点已经被占用，业界正在寻求在深水站点（水深 > 50m）安装涡轮机。然而，使用传统概念设计的 OWT 支撑结构在更深的水域中变得庞大且昂贵。相比之下，浮动 OWT 比底部支撑的更膨胀，并且被认为适用于 60 m 或更大的水深。最近提出了一种称为“底部支撑张力腿塔”(BSTLT) 的新型支撑结构概念，并显示了在更深的水域中使用底部支撑结构的可能性。在本文中，使用带有单桩的倾斜系绳实现了 BSTLT 概念的扩展。对 50 m 水深进行了初步技术可行性研究，包括固有频率的灵敏度和考虑就地操作和极端设计条件的动态分析。结果表明，所提出的概念可用于使基于单桩的支撑结构对于上述水深更具成本效益。